Laptop won't connect to the internet

[Howlin1]

Hello,
I am having a problem with the internet on my laptop. It takes a long time to connect to the internet in my apartment block. This has been happening for the last month and 9 days (before this it was connecting fine). I use my laptop in my college and my apartment. When I connect to the internet in my college (or at home) it will connect to the internet straight away.
When I connect to the internet in the college and then go back to my apartment and connect to the internet it normally connects fairly quick, but if I didn't connect to the internet in the college it would take a hell of a lot longer to connect to the internet (anywhere from a an hour or two to nine + hours). During that time it will connect to the router but say limited/no internet access and then it will disconnect and repeat.
How I know something is wrong with my laptop (until recently I thought it was something wrong with the router) is because I can connect to the internet in my apartment straight away if I use Ubuntu (I have Ubuntu 11.04 on an external hard drive).
Why is this happening and can anyone help (please)?
I don't have access/permission to do anything with the router if that's the problem.

 

[Howlin1]

Anyone?

 

[Howlin1]

Anyone at all?

 

[Roderunner]

Right click network icon on the task bar, open Network and Sharing centre, open Manage wireless networks, right click SSID name, properties and un tick auto connection. Repeat for all.

 

[Howlin1]

Thanks it seems to be working now. Just wondering but what caused that to happen and will I have to manually connect to it every time?

 

[Roderunner]

I have NO idea why it happened. Yes, you will have to connect to it every time. If your networks are not both in range at the same time, select one to auto connect, if it goes wrong, try the other one.